National Semiconductor Produces New Programmable Gain Amplifier

National Semiconductor LMP8100A LMP8100

National Semiconductor introduced the industry’s highest-precision programmable gain amplifier (PGA), enabling a new level of signal-conditioning performance in sensor interface applications and data acquisition systems targeting the industrial and instrumentation markets.


National’s LMP8100A delivers guaranteed 0.03 percent gain accuracy using a software adjustable gain (in 1 V/V increments) from 1 V/V to 16 V/V over the full industrial temperature range of -40 degrees C to 125 degrees C. National also offers the LMP8100 semi-precision grade PGA, which provides guaranteed 0.075 percent gain accuracy over the -40 degrees C to 85 degrees C temperature rage. The amplifiers closed-loop gain is set by an array of 16 precision thin-film resistors. At the core of the PGAs is a precision 33 MHz CMOS input, rail-to-rail, input/output (RRIO) operational amplifier with a typical open-loop gain of 110 dB.

Many instrumentation products require the designer to scale the output of a sensor to the full-scale input of an analog-to-digital converter (ADC) to ensure optimal sensitivity. National offers this analog signal-path solution for instrumentation products by combining the LMP8100A with a 1 mega-samples per second (MSPS), 12-bit, one-channel ADC -- such as the ADC121S021, ADC121S051 or ADC121S101.

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